Transaction not yet indexed

MUU91Z4wAGpRz5gfPHRPxpRTu4t6287KX7Vx5E74NdmTrEiyGuSULSZUNU8Tu1xuXy9fAXvBcLxm7SiP6yVNDmT

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.